package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkSpaceService;
import com.sky.vo.*;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkSpaceService workSpaceService;

    /**
     * 营业额统计
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //用来存放日期
        List<LocalDate> dateList = new ArrayList();


        dateList.add(begin);
        while (!begin.equals(end)) {
            //计算时间
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //用来存每日的营业额
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            //计算对应日期的营业额且状态为已完成的
            LocalDateTime benginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("begin", benginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            //如果当日没有营业额会出现null，要将其设置为0.0
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }
        //封装结果数据
        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

    /**
     * 规定时间用户统计
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //用来存放日期
        List<LocalDate> dateList = new ArrayList();

        dateList.add(begin);
        while (!begin.equals(end)) {
            //计算时间
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //用来存每日的新增用户
        List<Integer> newUserList = new ArrayList<>();
        //用来统计每日总用户
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            //计算对应日期的用户
            LocalDateTime benginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("end", endTime);
            //总用户数
            Integer totalUser = userMapper.countByMap(map);
            map.put("begin", benginTime);
            Integer newUser = userMapper.countByMap(map);
            totalUserList.add(totalUser);
            newUserList.add(newUser);

        }
        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();
    }

    /**
     * 指定时间内订单统计
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        //用来存放日期
        List<LocalDate> dateList = new ArrayList();

        dateList.add(begin);
        while (!begin.equals(end)) {
            //计算时间
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //每日订单数
        List<Integer> orderCountList = new ArrayList<>();
        //每日有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();
        for (LocalDate date : dateList) {
            //计算对应日期的用户
            LocalDateTime benginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //统计当天订单总数
            Integer orderCount = getOrderCount(benginTime, endTime, null);
            //统计当天有效订单总数
            Integer validOrderCount = getOrderCount(benginTime, endTime, Orders.COMPLETED);
            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }
        //订单总数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //有效订单总数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        //订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            //然后没有订单是不能进行相除的
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status) {
        Map map = new HashMap();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);
        return orderMapper.countByMap(map);
    }

    /**
     * 查看指定时间内销量top10
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getTop10(LocalDate begin, LocalDate end) {
        LocalDateTime benginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(benginTime, endTime);
        //商品名称列表
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");
        //销量列表，
        List<Integer> number = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(number, ",");

        return SalesTop10ReportVO
                .builder().
                nameList(nameList)
                .numberList(numberList)
                .build();

    }

    /**
     * 导出运营报表
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) throws Exception {
        //1.查询数据库获取数据---30天
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);
        BusinessDataVO businessDataVO = workSpaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));
        //通过POI将数据写入表中
        //InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表");
        InputStream in = new FileInputStream(new File("D:\\Java培训\\JavaWep\\项目一\\苍穹外卖\\sky-take-out\\sky-server\\src\\main\\resources\\template\\运营数据报表.xlsx"));
        try {
            //基于模板文件创建一个Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);
            //获取表格文件的Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            //填充时间
            sheet.getRow(1).getCell(1).setCellValue("时间"+dateBegin+"至"+dateEnd);
            //获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            //获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业额
                BusinessDataVO businessData = workSpaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                //获得某一行
                row = sheet.getRow(7+i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }
            //3.通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            //关闭资源
            out.close();
            excel.close();

        } catch (IOException e) {
            e.printStackTrace();
        }
        //通过输出流将表单下载到客户单浏览器
    }
}
